http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Lee, Jeongman,Lee, Kisong,Cho, Dong-Ho Institute of Electrical and Electronics Engineers 2017 IEEE transactions on power electronics Vol. No.
<P>We investigate the stability of the transmission efficiency (TE) in nonradiative wireless power transfer (WPT) using a relay resonator. An equivalent circuit model is used to show mathematically that two suppositions are satisfied in an overcoupled region: first, the TE of relay-based WPT systems is always larger than that of conventional two-coil-basedWPT systems, and second, as the coupling coefficient increases, the TE of two-coil-basedWPT systems decreases severely, while the TE of relay-based WPT systems increases slightly. Consequently, we surmise that an intermediate relay can be used to achieve higher TE and stability, compared with conventional two-coil-based WPT systems. We verify that our analytical results are in good agreement with the experimental ones.</P>
2 stage CVT 가속성능 개선 변속 제어 알고리즘 개발
박정만(Jeongman Park),지건(Jian Ji),권오은(Oheun Kwon),채민재(Minjae Chai),심장선(Jangsun Sim),임광혁(Kwanghyuk Lim),조서연(Seoyeon Cho),김현수(Hyunsoo Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this study, a 2 stage CVT shift control algorithm is proposed for kickdown shift to improve acceleration performance. The proposed shift control algorithm controls a desired secondary pressure to increase a variator shift speed and a release clutch pressure to shift a planetary gear smoothly. In order to evaluate acceleration performance of the control algorithm, a 2 stage CVT vehicle simulator is developed based on MATLAB/Simulink and SimDriveline. It is found from the simulation results that an acceleration performance is improved in terms of an increase of variator shift speed.
임정만(Jeongman Lim),박주용(Jooyong Park) 한국인지과학회 2010 인지과학 Vol.21 No.4
본 연구에서는 수학 학습을 위한 평가 도구로 풀이 과정을 답지로 이용한 시험 방식이 제안되었고, 그 효과가 검증되었다. 풀이된 예제 연구에 따르면, 학생들에게 문제에 대한 단계적인 해결책인 풀이된 예제를 문제 사이에 제시할 경우, 문제만 풀 때보다 효과적으로 학습한다. 그러나 풀이된 예제의 단순한 제시는 학습 효과가 제한적이라는 최근의 발견들이 있었다. 이에 따라 본 연구에서는 학습자가 풀이된 예제를 더 적극적으로 탐구하게 하는 방법으로 풀이과정을 선다형의 답지로 제시하였다. 이 시험 방식은 컴퓨터화 시험으로 구현되었으며, 학생들이 컴퓨터에서 단답형으로 문제를 풀고 나서 답지를 요청하면 선다형 답지가 제시되었다. 이 때 실험 집단은 답지가 풀이 과정으로, 비교 집단은 전통적 선다형과 같이 최종 정답으로 구성되었다. 초등학교 6학년 학생들을 대상으로 실험이 수행되었다. 사후 검사 결과 실험집단의 평균 점수가 비교집단의 평균 점수보다 높았다. 이 결과는 풀이 과정을 답지로 이용한 시험 방식이 교실현장에서 학습을 촉진하기 위한 도구로 활용될 수 있음을 시사한다. 끝으로 후속 연구의 방향성이 논의되었다. The present study proposes and examines a new type of multiple-choice math test. In this format, the options are the intermediate derivatives of the math problem solution process rather than the final answers. This idea originates from the studies on the effect of worked-out examples. In these studies, it has been shown that students learn better when they were presented with worked-out examples than when presented with final answers by themselves. In line with these findings, we introduced the intermediate derivatives of the solution process as the options of multiple-choice items so that the test-taker will have a chance to examine the solution process. The test was implemented as a computerized test in which students can solve problems in a short answer format, and then pick a multiple-choice option which appears when requested. The experimental group had multiple-choice options which were intermediate derivatives of the solution process, and the control group had the final answers as the options as in most multiple-choice tests. The participants were 6th graders in elementary school. The posttest results revealed that the average score of the experimental group was higher than that of the control group. The results suggest that tests that use intermediate derivatives of the problem solution process as options can be used as learning tools in the classrooms. Finally, directions for further studies were discussed.
이정만(Jeongman Lee),김지현(Ji Hyun Kim),헤녹 열니아스 피브리안토,김갑환(Kap Hwan Kim),홍순도(Soondo Hong) 한국SCM학회 2018 한국SCM학회지 Vol.18 No.2
Configurable flat-glass racks store flat-glasses efficiently and safely while delivering them from a manufacturing facility to construction sites. This paper describes an executable Rack Packing Model (RPM) that determines the number of racks, assigns glasses to racks, and configures each rack for glasses. We formulate an optimal rack packing model using a mixed-integer programming (MIP). We build the MIP model for practical-size problems by dividing the rack-selection procedure and linearizing the rack-configuration-related logical constraints. In addition, we also present a greedy procedure, which is termed as the worker’s First Fit Decreasing heuristic algorithm (FFD). Our computational comparison confirms that both the MIP model and FFD algorithm obtain optimal solutions to practical examples. This comparison result demonstrates that configurable flat-glass racks can be operated efficiently by simple heuristics.